Gurobi 5.0.1 (linux64) logging started Mon Feb  4 17:14:19 2013

Optimize a model with 1768 rows, 50733 columns and 2712905 nonzeros
Presolve removed 44 rows and 246 columns (presolve time = 5s) ...
Presolve removed 44 rows and 369 columns
Presolve time: 9.19s
Presolved: 1724 rows, 50364 columns, 2692472 nonzeros
Variable types: 0 continuous, 50364 integer (50364 binary)
Found heuristic solution: objective 25245.000000

Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
    7552    1.9392447e+04   9.518850e+02   0.000000e+00      5s
   10854    1.9522803e+04   7.776872e+02   0.000000e+00     10s
   12512    1.9539000e+04   0.000000e+00   0.000000e+00     14s

Root relaxation: objective 1.953900e+04, 12512 iterations, 13.99 seconds
Total elapsed time = 25.22s

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0 19539.0000    0   54 25245.0000 19539.0000  22.6%     -   25s
H    0     0                    23706.000000 19539.0000  17.6%     -   26s
*    0     0               0    19543.000000 19543.0000   0.0%     -   29s

Cutting planes:
  Clique: 2
  Zero half: 6

Explored 0 nodes (14259 simplex iterations) in 29.45 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.954300000000e+04, best bound 1.954300000000e+04, gap 0.0%